only had my 2010 e350cdi estate 6 months, had an A service carried out by local indie at 50.000 miles, Good condition report with no concerns(car has come from japan after 11years) with a view to B service including auto box oil and filter at end of this year, Just replaced dpf pressure sensor and had to remove rh filter box for access, so while it was out had a look at air filter, pic below, genuine MB parts with Mann pt, no aswell, got replacements from Eurocarparts perfect fit and quality looks good £30.39 for the pair. Milage now 54,300miles, car looks like new underneath! Service book I have states 75,000kms/4 years for air filter change.